The use of image recognition technology can directly determine the status of GIS switches, but the power supply problem of related devices urgently needs to be solved. This article designs a GIS switch status judgment device based on image recognition, and uses wireless power transmission technology to power the device. Based on the characteristics of the device, asymmetric coils were used, and nine magnetic core design structures were proposed. The magnetic core parameters and layout were studied. After finite element simulation, an optimized magnetic core design scheme was selected, which resulted in a 9.6% reduction in mutual inductance while saving approximately 38.59% of magnetic core usage.